Calculate the Net bill program

import java.io.*;
public class bill
{
    public static void main() throws IOException
    {
BufferedReaderbr=new BufferedReader(new InputStreamReader(System.in));
System.out.println("Enter the total cost");
    double T=Double.parseDouble(br.readLine());
    double D=0.0;
    double NA=0.0;
    if(T<=2000)
    {
       D=T*5/100;
       NA=T-D;
    }
    else if(T>=2001&&T<=5000)
    {
        D=T*25/100;
        NA=T-D;
    }
    else
    {
       D=T*50/100;
       NA=T-D;
    }
System.out.println("Total cost is"+T+"Rs.");
System.out.println("The discount is"+D+"Rs.");
System.out.println("Net bill is="+NA+"Rs.");
    }
}